2014-08-12 04:29:47 +02:00
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// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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2014-09-02 16:54:50 +02:00
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2014-08-14 03:14:47 +02:00
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package hi
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2014-08-12 04:29:47 +02:00
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import (
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"bytes"
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"unicode/utf8"
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2014-08-28 21:38:57 +02:00
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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2014-08-12 04:29:47 +02:00
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)
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2014-08-14 03:14:47 +02:00
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const StemmerName = "stemmer_hi"
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2014-08-12 04:29:47 +02:00
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type HindiStemmerFilter struct {
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}
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func NewHindiStemmerFilter() *HindiStemmerFilter {
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return &HindiStemmerFilter{}
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}
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func (s *HindiStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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// if not protected keyword, stem it
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if !token.KeyWord {
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stemmed := stem(token.Term)
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token.Term = stemmed
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}
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}
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2014-09-24 00:41:32 +02:00
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return input
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2014-08-12 04:29:47 +02:00
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}
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func stem(input []byte) []byte {
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inputLen := utf8.RuneCount(input)
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// 5
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if inputLen > 6 &&
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(bytes.HasSuffix(input, []byte("ाएंगी")) ||
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bytes.HasSuffix(input, []byte("ाएंगे")) ||
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bytes.HasSuffix(input, []byte("ाऊंगी")) ||
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bytes.HasSuffix(input, []byte("ाऊंगा")) ||
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bytes.HasSuffix(input, []byte("ाइयाँ")) ||
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bytes.HasSuffix(input, []byte("ाइयों")) ||
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bytes.HasSuffix(input, []byte("ाइयां"))) {
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return analysis.TruncateRunes(input, 5)
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}
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// 4
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if inputLen > 5 &&
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(bytes.HasSuffix(input, []byte("ाएगी")) ||
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bytes.HasSuffix(input, []byte("ाएगा")) ||
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bytes.HasSuffix(input, []byte("ाओगी")) ||
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bytes.HasSuffix(input, []byte("ाओगे")) ||
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bytes.HasSuffix(input, []byte("एंगी")) ||
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bytes.HasSuffix(input, []byte("ेंगी")) ||
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bytes.HasSuffix(input, []byte("एंगे")) ||
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bytes.HasSuffix(input, []byte("ेंगे")) ||
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bytes.HasSuffix(input, []byte("ूंगी")) ||
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bytes.HasSuffix(input, []byte("ूंगा")) ||
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bytes.HasSuffix(input, []byte("ातीं")) ||
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bytes.HasSuffix(input, []byte("नाओं")) ||
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bytes.HasSuffix(input, []byte("नाएं")) ||
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bytes.HasSuffix(input, []byte("ताओं")) ||
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bytes.HasSuffix(input, []byte("ताएं")) ||
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bytes.HasSuffix(input, []byte("ियाँ")) ||
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bytes.HasSuffix(input, []byte("ियों")) ||
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bytes.HasSuffix(input, []byte("ियां"))) {
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return analysis.TruncateRunes(input, 4)
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}
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// 3
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if inputLen > 4 &&
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(bytes.HasSuffix(input, []byte("ाकर")) ||
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bytes.HasSuffix(input, []byte("ाइए")) ||
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bytes.HasSuffix(input, []byte("ाईं")) ||
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bytes.HasSuffix(input, []byte("ाया")) ||
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bytes.HasSuffix(input, []byte("ेगी")) ||
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bytes.HasSuffix(input, []byte("ेगा")) ||
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bytes.HasSuffix(input, []byte("ोगी")) ||
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bytes.HasSuffix(input, []byte("ोगे")) ||
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bytes.HasSuffix(input, []byte("ाने")) ||
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bytes.HasSuffix(input, []byte("ाना")) ||
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bytes.HasSuffix(input, []byte("ाते")) ||
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bytes.HasSuffix(input, []byte("ाती")) ||
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bytes.HasSuffix(input, []byte("ाता")) ||
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bytes.HasSuffix(input, []byte("तीं")) ||
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bytes.HasSuffix(input, []byte("ाओं")) ||
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bytes.HasSuffix(input, []byte("ाएं")) ||
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bytes.HasSuffix(input, []byte("ुओं")) ||
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bytes.HasSuffix(input, []byte("ुएं")) ||
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bytes.HasSuffix(input, []byte("ुआं"))) {
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return analysis.TruncateRunes(input, 3)
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}
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// 2
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if inputLen > 3 &&
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(bytes.HasSuffix(input, []byte("कर")) ||
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bytes.HasSuffix(input, []byte("ाओ")) ||
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bytes.HasSuffix(input, []byte("िए")) ||
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bytes.HasSuffix(input, []byte("ाई")) ||
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bytes.HasSuffix(input, []byte("ाए")) ||
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bytes.HasSuffix(input, []byte("ने")) ||
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bytes.HasSuffix(input, []byte("नी")) ||
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bytes.HasSuffix(input, []byte("ना")) ||
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bytes.HasSuffix(input, []byte("ते")) ||
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bytes.HasSuffix(input, []byte("ीं")) ||
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bytes.HasSuffix(input, []byte("ती")) ||
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bytes.HasSuffix(input, []byte("ता")) ||
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bytes.HasSuffix(input, []byte("ाँ")) ||
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bytes.HasSuffix(input, []byte("ां")) ||
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bytes.HasSuffix(input, []byte("ों")) ||
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bytes.HasSuffix(input, []byte("ें"))) {
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return analysis.TruncateRunes(input, 2)
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}
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// 1
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if inputLen > 2 &&
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(bytes.HasSuffix(input, []byte("ो")) ||
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bytes.HasSuffix(input, []byte("े")) ||
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bytes.HasSuffix(input, []byte("ू")) ||
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bytes.HasSuffix(input, []byte("ु")) ||
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bytes.HasSuffix(input, []byte("ी")) ||
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bytes.HasSuffix(input, []byte("ि")) ||
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bytes.HasSuffix(input, []byte("ा"))) {
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return analysis.TruncateRunes(input, 1)
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}
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return input
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}
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2014-08-14 03:14:47 +02:00
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func StemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewHindiStemmerFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(StemmerName, StemmerFilterConstructor)
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}
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